[s5e8] What's Past Is Prologue Apr 2026

is the 100th episode of The Flash , originally airing on December 4, 2018. It serves as a commemorative milestone that balances a trip down memory lane with the urgent need to defeat the season’s "Big Bad," Cicada. Critical Consensus

: The plot follows Barry and Nora as they travel back in time to retrieve items needed to stop Cicada. This allows for the return of iconic villains like Savitar, Zoom, and Eobard Thawne. [S5E8] What's Past is Prologue

: The episode succeeds in showing Nora the darker parts of her father’s history, though IGN argued it didn't fully realize its potential for deeper character development beyond the nostalgia. is the 100th episode of The Flash ,